Adds Windows ARM 64 Build script and related fixes (#18536)

Co-authored-by: Joseph Gershgorin <jgershgorin@biocentury.com>

.github/workflows/MSYS2.yml

@@ -14,8 +14,21 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        sys: [MINGW64, UCRT64,CLANG64]
-    runs-on: windows-latest
+        include:
+          # Existing x64 builds
+          - sys: MINGW64
+            runner: windows-latest
+          - sys: UCRT64
+            runner: windows-latest
+          - sys: CLANG64
+            runner: windows-latest
+
+          # New ARM64 build (native Windows on ARM)
+          - sys: CLANGARM64
+            runner: windows-11-arm
+
+    runs-on: ${{ matrix.runner }}
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -25,7 +38,9 @@ jobs:
         with:
           msystem: ${{ matrix.sys }}
           update: true
-          install: base-devel git
+          install: >-
+            base-devel
+            git
           pacboy: >-
             gettext:p
             gobject-introspection:p
@@ -57,17 +72,18 @@ jobs:
       - name: Configure and build RetroArch
         shell: msys2 {0}
         run: |
-          echo "Building RetroArch in ${{ matrix.sys }} environment"
+          echo "Building RetroArch in ${{ matrix.sys }} on ${{ matrix.runner }}"
           ./configure
-          make -j$(nproc) info all
+          make -j"$(nproc)" info all
 
       - name: Collect DLLs and binaries
         shell: msys2 {0}
         run: |
           echo "Collecting DLLs and binaries"
+          rm -rf dist
           mkdir -p dist
           cp retroarch.exe dist/
-          ldd retroarch.exe|grep $MINGW_PREFIX |awk '{print $3}'|xargs -I {} cp {} dist/
+          ldd retroarch.exe | grep "$MINGW_PREFIX" | awk '{print $3}' | xargs -I {} cp {} dist/ || true
 
       - name: Archive build artifacts
         if: success()

.github/workflows/Windows-ARM64.yml

@@ -0,0 +1,44 @@
+name: CI Windows ARM64 (MSVC)
+
+on:
+  push:
+  pull_request:
+  repository_dispatch:
+    types: [run_build]
+
+permissions:
+  contents: read
+
+env:
+  ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true
+
+jobs:
+  msvc:
+    runs-on: windows-11-arm
+    strategy:
+      matrix:
+        version: [2022]
+        configuration: [Debug, Release]
+        platform: [ARM64]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Add msbuild to PATH
+        uses: microsoft/setup-msbuild@v1
+
+      - name: Compile RA
+        working-directory: "${{ github.workspace }}/pkg/msvc"
+        run: |
+          msbuild -p:"Configuration=${{ matrix.configuration }}" -p:"Platform=${{ matrix.platform }}" .\RetroArch-msvc${{ matrix.version }}.sln
+
+      - name: Get short SHA
+        id: slug
+        shell: powershell
+        run: echo "sha8=$('${{ github.sha }}'.Substring(0,8))"  >> $env:GITHUB_OUTPUT
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: retroarch-${{ matrix.version }}-${{ matrix.configuration }}-${{ matrix.platform }}-${{ steps.slug.outputs.sha8 }}
+          path: |
+            pkg/msvc/${{ matrix.platform }}/${{ matrix.configuration }}/RetroArch-msvc${{ matrix.version }}.exe

config.def.h

@@ -1847,6 +1847,9 @@
 #define DEFAULT_BUILDBOT_SERVER_URL "http://buildbot.libretro.com/nightly/windows/x86_64/latest/"
 #elif defined(__i386__) || defined(__i486__) || defined(__i686__) || defined(_M_IX86) || defined(_M_IA64)
 #define DEFAULT_BUILDBOT_SERVER_URL "http://buildbot.libretro.com/nightly/windows/x86/latest/"
+#elif defined(__aarch64__) || defined(_M_ARM64)
+/* No official MinGW/clang ARM64 buildbot yet – use empty default */
+#define DEFAULT_BUILDBOT_SERVER_URL ""
 #endif
 #endif
 #elif defined(__linux__)

deps/mbedtls/timing.c

@@ -43,6 +43,13 @@
 #include <windows.h>
 #include <winbase.h>
 
+#if defined(__MINGW32__) || defined(__MINGW64__)
+/* MSYS2/MinGW: provide struct timeval + gettimeofday() for the
+ * fallback timing implementation used when HAVE_HARDCLOCK
+ * isn't defined (e.g., on aarch64-w64-mingw32 / clangarm64). */
+#include <sys/time.h>
+#endif
+
 struct _hr_time
 {
     LARGE_INTEGER start;